Dolby ProLogic IIz is a brand new DSP. It has only recently started showing up on home theater receivers. The Onkyo TX-SR607 has only started hitting store shelves and already Atlantic Technology had a speaker optimized for th PLIIz processing. The 1400 SR-z is a selectable dipole\/bipole speaker with a compact size and shallow profile. At just over a foot wide, less than half a foot deep, and 8" tall, they are definitely compact. They are only 7lbs each so hanging them shouldn't be much of a problem.\n\n\nDiscuss "Atlantic Technology 1400 SR-z Height Speakers" here. Read the article.